Unverified Commit cdd1b2bd authored by Jisheng Zhang's avatar Jisheng Zhang Committed by Palmer Dabbelt
Browse files

riscv: kprobes: Implement alloc_insn_page() 



Allocate PAGE_KERNEL_READ_EXEC(read only, executable) page for kprobes
insn page. This is to prepare for STRICT_MODULE_RWX.

Signed-off-by: default avatarJisheng Zhang <jszhang@kernel.org>
Signed-off-by: default avatarPalmer Dabbelt <palmerdabbelt@google.com>
parent 300f62c3

arch/riscv/kernel/probes/kprobes.c

+8 −0
Original line number Diff line number Diff line
@@ -84,6 +84,14 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p) 
	return 0;

}



void *alloc_insn_page(void)

{

	return  __vmalloc_node_range(PAGE_SIZE, 1, VMALLOC_START, VMALLOC_END,

				     GFP_KERNEL, PAGE_KERNEL_READ_EXEC,

				     VM_FLUSH_RESET_PERMS, NUMA_NO_NODE,

				     __builtin_return_address(0));

}



/* install breakpoint in text */

void __kprobes arch_arm_kprobe(struct kprobe *p)

{